Tetsuo Sekigawa (関川 哲夫, Sekigawa Tetsuo, February 5, 1951 – June 23, 2017) was a Japanese professional wrestler best known for his work under the ring name Mr. Pogo (ミスター・ポーゴ, Misutā Pōgo). He helped popularize hardcore wrestling in the 1990s with "death matches" in promotions such as Frontier Martial-Arts Wrestling, W*ING and Big Japan Pro Wrestling.